Better measure calorie burn, understand resting heart rate & more with 24/7 heart rate tracking and a battery life of up to 7 days (varies with use and other factors); charge time (0 to100 percent) 2 hours

Choose from 15 plus exercise modes like run, bike, swim, yoga, circuit training and more, set a goal, and get real time stats during your workouts to see how you can keep getting better

It accurately tracks all-day stats like steps taken, distance traveled, calories burned, floors climbed, active minutes. Lets you see daily fitness stats and the time of day on the bright LED display. The 2 version adds a heart rate sensor and larger display.